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Alternative: Midi -> CV Alternative: CV from something else VCF MK's Diode Ladder VCF Kassutronic's KS-20 https://kassu2000.blogspot.com/2019/07/ks-20-filter.html ** uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the front panel and Pin 1, horizontal PCB mount, https://www.neutrik.com/en/product/nc3mbv-1 B Series, 3 pole XLR female receptacle with 6.35mm (1/4in) stereo jack, switched, with full threaded nose and offset PCB pins, https://www.neutrik.com/en/product/nmj4hhd2 M Series, 6.35mm (1/4in) mono jack without switching contact, horizontal PCB mount, https://www.neutrik.com/en/product/nc3mbv-0 B Series, 3 pole XLR female receptacle with 6.35mm (1/4in) stereo jack, horizontal PCB mount, retention spring instead of latch, https://www.neutrik.com/en/product/nc3faah-0 AA Series, 3 pole female XLR receptacle, grounding: separate ground contact to mating connector shell and front panel, lateral left PCB mount, retention spring instead of latch, https://www.neutrik.com/en/product/nc3fav-0 A Series, 3 pole male XLR receptacle, grounding: mating connector shell to pin1 and front panel, vertical PCB mount, https://www.neutrik.com/en/product/nc3fah1 A Series, 3 pole female XLR receptacle, grounding: separate ground contact to mating connector shell and front panel, vertical PCB mount, https://www.neutrik.com/en/product/nc3fahr1 A Series, 3 pole female XLR receptacle, grounding: separate ground contact to mating connector shell and front panel, horizontal PCB mount, https://www.neutrik.com/en/product/nc3maah AA Series, 3 pole female XLR receptacle, grounding: mating connector shell and front panel, horizontal PCB mount, http://cherryamericas.com/wp-content/uploads/2014/12/mx_cat.pdf Cherry MX keyswitch 2.75u plate Cherry MX keyswitch 1.00u PCB Cherry MX keyswitch, 2.00u, vertical, plate mount, http://cherryamericas.com/wp-content/uploads/2014/12/mx_cat.pdf Cherry MX keyswitch, 2.25u, PCB mount, retention spring instead of the mounting holes 47.1mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 37-pin D-Sub connector, horizontal/angled (90 deg), THT-mount, male, pitch 2.41x1.98mm, pin-PCB-offset 8.35mm, distance of mounting holes distance 33.3mm 15-pin D-Sub connector, horizontal/angled (90 deg), THT-mount, male, pitch 2.77x2.54mm, pin-PCB-offset 9.4mm, see http://docs-europe.electrocomponents.com/webdocs/1585/0900766b81585df2.pdf 15-pin D-Sub connector horizontal angled 90deg THT male pitch 2.29x1.98mm pin-PCB-offset 3.0300000000000002mm mounting-holes-distance 33.3mm.

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